“main” is the new default branch

Author: kelson42

README.md

@@ -1,7 +1,7 @@
 zimscraperlib
 =============
 
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+[![Build Status](https://github.com/openzim/python-scraperlib/workflows/CI/badge.svg?query=branch%3Amain)](https://github.com/openzim/python-scraperlib/actions?query=branch%3Amain)
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